error at run

Metal001.xcodeproj/project.pbxproj

@@ -7,13 +7,15 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		7C9B532C21437209009BEDF7 /* Shaders.metal in Sources */ = {isa = PBXBuildFile; fileRef = 7C9B532B21437209009BEDF7 /* Shaders.metal */; };
 		7CAC470821205D7600AF9C83 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7CAC470721205D7600AF9C83 /* AppDelegate.swift */; };
 		7CAC470C21205D7700AF9C83 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 7CAC470B21205D7700AF9C83 /* Assets.xcassets */; };
 		7CAC470F21205D7700AF9C83 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 7CAC470D21205D7700AF9C83 /* Main.storyboard */; };
 		7CAC471821205DA300AF9C83 /* MetalView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7CAC471721205DA300AF9C83 /* MetalView.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		7C9B532B21437209009BEDF7 /* Shaders.metal */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.metal; path = Shaders.metal; sourceTree = "<group>"; };
 		7CAC470421205D7600AF9C83 /* Metal001.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Metal001.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		7CAC470721205D7600AF9C83 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		7CAC470B21205D7700AF9C83 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -55,6 +57,7 @@
 			children = (
 				7CAC470721205D7600AF9C83 /* AppDelegate.swift */,
 				7CAC471721205DA300AF9C83 /* MetalView.swift */,
+				7C9B532B21437209009BEDF7 /* Shaders.metal */,
 				7CAC470B21205D7700AF9C83 /* Assets.xcassets */,
 				7CAC470D21205D7700AF9C83 /* Main.storyboard */,
 				7CAC471021205D7700AF9C83 /* Info.plist */,
@@ -133,6 +136,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				7C9B532C21437209009BEDF7 /* Shaders.metal in Sources */,
 				7CAC471821205DA300AF9C83 /* MetalView.swift in Sources */,
 				7CAC470821205D7600AF9C83 /* AppDelegate.swift in Sources */,
 			);

Metal001/MetalView.swift

@@ -11,24 +11,51 @@ import MetalKit
 
 class MetalView: MTKView {
 
+    var commandQueue: MTLCommandQueue?
+    var rps: MTLRenderPipelineState?
+    var vertexData: [Float]?
+    var vertexBuffer: MTLBuffer?
+
+    required init(coder: NSCoder) {
+        super.init(coder: coder)
+        render()
+    }
+
     override func draw(_ dirtyRect: NSRect) {
         super.draw(dirtyRect)
-        render()
+        if let drawable = currentDrawable, let rpd = currentRenderPassDescriptor {
+            rpd.colorAttachments[0].clearColor = MTLClearColorMake(0, 0.5, 0.5, 1.0)
+            let commandBuffer = device!.makeCommandQueue()?.makeCommandBuffer()
+            let commandEncoder = commandBuffer?.makeRenderCommandEncoder(descriptor: rpd)
+
+            commandEncoder?.setRenderPipelineState(rps!)
+            commandEncoder?.setVertexBuffer(vertexBuffer, offset: 0, index: 0)
+            commandEncoder?.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 3, instanceCount: 1)
+            commandEncoder?.endEncoding()
+            commandBuffer?.present(drawable)
+            commandBuffer?.commit()
+        }
     }
 
     func render () {
-        let device = MTLCreateSystemDefaultDevice()!
-        self.device = device
-        let rpd = MTLRenderPassDescriptor()
-        let bleen = MTLClearColor(red: 0, green: 0.5, blue: 0.5, alpha: 1)
-        rpd.colorAttachments[0].texture = currentDrawable!.texture
-        rpd.colorAttachments[0].clearColor = bleen
-        rpd.colorAttachments[0].loadAction = .clear
-        let commandQueue = device.makeCommandQueue()
-        let commandBuffer = commandQueue?.makeCommandBuffer()
-        let encoder = commandBuffer?.makeRenderCommandEncoder(descriptor: rpd)
-        encoder?.endEncoding()
-        commandBuffer?.present(currentDrawable!)
-        commandBuffer?.commit()
+        device = MTLCreateSystemDefaultDevice()!
+        commandQueue = device!.makeCommandQueue()
+        vertexData = [-1.0,   -1.0,   0.0,    1.0,
+                      1.0,    -1.0,   0.0,    1.0,
+                      0.0,    1.0,    0.0,    1.0]
+        let dataSize = vertexData!.count * MemoryLayout<Float>.size
+        vertexBuffer = device!.makeBuffer(bytes: vertexData!, length: dataSize, options: [])
+        let library = device!.makeDefaultLibrary()!
+        let vertex_func = library.makeFunction(name: "vertex_func")
+        let frag_func = library.makeFunction(name: "fragment_func")
+        let rpld = MTLRenderPipelineDescriptor()
+        rpld.vertexFunction = vertex_func
+        rpld.fragmentFunction = frag_func
+        rpld.colorAttachments[0].pixelFormat = .bgra8Unorm
+        do {
+            try rps = device!.makeRenderPipelineState(descriptor: rpld)
+        } catch let error {
+            self.printView("\(error)")
+        }
     }
 }

Metal001/Shaders.metal

@@ -0,0 +1,22 @@
+//
+//  Shaders.metal
+//  Metal001
+//
+//  Created by Michael Vilabrera on 9/7/18.
+//  Copyright © 2018 Michael Vilabrera. All rights reserved.
+//
+
+#include <metal_stdlib>
+using namespace metal;
+
+struct Vertex {
+    float4 position [[position]];
+};
+
+vertex Vertex vertex_func(constant Vertex *vertices [[buffer(0)]], uint vid [[vertex_id]]) {
+    return vertices[vid];
+}
+
+fragment float4 fragment_func(Vertex vert [[stage_in]]) {
+    return float4(0.7, 1, 1, 1);
+}

README.md

@@ -1 +1,2 @@
 http://metalkit.org/2016/01/11/using-metalkit-part-1.html
+http://metalkit.org/2016/01/18/using-metalkit-part-2.html